Ask a joke of five people, English is ok, but it should be simple, humorous and urgent!

A treat, * * * invited five people, but only four people, very uncomfortable, so he said:

"It's time."

The first guest is useless: "What do you mean, I shouldn't come?" So I got up and left.

At first glance, I don't understand: "I shouldn't have left."

The second guest frowned: "You shouldn't have left? Should I go? " So I got up and left.

A is even more puzzled: "I didn't say anything about him."

The third guest couldn't help it: "So he said me?" Also got up and left.

Anxious, A grabbed the fourth guest and said sincerely, "You know, I'm really not talking about the three of them."

The fourth guest couldn't bear it anymore and replied angrily, "I know!" " "After that, I left.